New Hampshire public health officials say some customers and workers at a Portsmouth restaurant may have been exposed to measles last week, but a widespread outbreak is unlikely given the state's high vaccination rate.

The Department of Health and Human Services says an international traveler who has been diagnosed with measles while visiting Massachusetts also spent time in New Hampshire. The only known public exposure site in New Hampshire was the Flatbread Company restaurant in Portsmouth.

The state is encouraging anyone who was there on April 20 between 3 p.m. and 6 p.m. to monitor themselves for symptoms, which include high fever, cough, runny nose and conjunctivitis several days before the development of a body rash.